Broaching-machine.



R.R.LA1 01NTB. BEOAGHING MACHINE. P PLIGATION FILED NOV. 14, 19115 Patented June 4, 1912. y

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R. R. LAPOINTB BROAGHING MACHINE.

APPLICATION FILED NOV.14, 1911.

1,028,825, Patented June 4, 1912 3 SHEETS-SHEET 3.

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RALPH R. LAPOINTE, OF HUDSON, MASSACHUSETTS, ASSIGNOR, BY MSNE lASSIGN- `1VI}il1\l".1'.S, TO LAPOINTE MACHINE TOOL CO., OF HUDSON, MASSACHUSETTS, A COR/YO- RATION or Marian.

To all whom-it may concern: v.

Be it known that l, RALPH'R. LAroINTE,

l a citizen of thevUnit'ed 4State-sand resident "of Hudson, county -9`f.l\/Iiddlesex, State of h'lassachusetts,.v have* invented an Improve-.

nient in` Broachingdilachinesof which the following escriptiomin nnection with the accompanyingdrawings, i specification.,

' like letters en parts.'

th'edrawings representing like is wellv adaptedfrbreaching out key-ways f inl gears andi-other wheels.

-, provide'fa mounting-,offthe operating draw. screw which insures its..accurateyalinement Amongthe y'objects of the invention areto and propercooperation with thefbroach, this mount-ing being arranged l to support the screw ii'idependently of the -n'ut which im- .parts its reciprocation so that the screw has 3o,- ing drive, with ajcontrol adapt-ed to supply a free bearing insa-id nut enabling proper lubrication f to be assured; and vvprikaventin'g the possibility otfany binding between these parts. i Another lobject of the invention isto provide effective and adequate lubricating mechanisin both for thetool and for the operatthe lubricant only when needed.V

' f still'ffurtlier object. of the ,invent-ion is to provideasiniple and effective means for -nection with the vaccompanying drawings,

controlling the movements of the broaeh and locking its operating mechanism in rinoperative position after a cutting stroke. 4

The above and other features of the in-v vention willbe better understood from the following detaileddescription, taken in conand will be thereafter pointed out in the app'ended claims. f

Referring to the drawings, lljigure 1 .is a side eleva tion vof a breaching machine whereininyninvention is incorporated, certain parts being4 broken awayin section.

portions at the -end being broken away. Fig. 3 is Va detail sectional view on line of Fig.v 1. Fig. 4 is an enlargedjdetail section onflinetofHFig. 1. .-Fig.v 5 is'a detail showing Athe construction` ofthecontrolling lever..v Fig.: 6 isa sectionaldetail showing Specification of Letters Patent.

ltransversesection Vthrough the slideways,

zontal draw cutbreaching machine, .the bed 1 Vextends'generally in a lengthwise direc- A Fig-2 is ail longitudinal vertical `section through the machine, showing the operating mechanism',

:BRoAoHINe-MACHINE.

Patented J une 4, 1,912.v

l i' (Application lfiled November 14, 19.11. ASeriell-Zitto. 660,235.

the valve control of the lubricant.. Fig. 7 is a sectional view taken on line' 7-7 of Fig. 2. Fig. 8 is an enlarged fragmentary plan view'showing the slide head. Fig'. 9 isa showing the ycharacter of engagement between the operating screw and its mit. Fig. l() is a detail hereinafter referred to.. Fig.

11 isa detail sectional -vieiv ofalubricant. forcing pump, and Fig. 12 is a detail showing the Aconnections flor foperating suoli um i ' In the illustrative 'embodiment shown,

wherein -tlie'invention is applied to a horition and-'is sup-ported* on a frontpedestal 2 anda-rear pedestal 3, the latter being the i larger tosupport and steady the driving mechanism. This bed has an open top,'as 75 seen at It, and its front end has-a vertical face 5v to. which af face plate 6, with usual T-slots in its outer face, is removably secured as by screw bolts 7 This face plate construction enables vspecial fixtures or jigs to be engaged t iii-*the T-slots-sothat odd shaped work inay easily be clamped to the face plate to be operated on by the broach.

vThe broach 8 may be of usual or any de- -siredform and. guided through the face plate 6 to operate 'on a piece lof work shown as a.

gear a by anyr usual or suitable guiding arbor. y The broach isconnected with a long,

heavy screw 9 to be lactuated thereby. by means of a slide head .10. lThis head is composed of a block 11 having a threaded aperture in whichathreaded extremity '1 9 of the screw is fitted, the screw being held from turning in operation 4by a transverse locking pin or screw 12a. The block 11 extends between and is guided valong tapered ways formed'on ribs 413 which extend inward at either side from the' `framework 1.v T hese ways, as shown Fig. 9are tapered both vfromfbeneatlrand above,` and to provide for acontinued close tit'of the ,head along these lways, adjustable wear blocks or gibs .14 are ftittedl for adjustmentagainst the upper tapered surfaces bymeans of screw bolts 15. f

.' The broach isi engagedy Ywith. the slide headby means,offfal head-portion 16 interlocle'd witlitheffpartll forvertica'l adjust-- gagement with the portion 16. The) iinmediate connection of the broach with the portioni16 may beeffected in any suitable'manner, as by a connector 19 threaded into the within the rigidly supported tube 22v and' the rollers 21 pei'mit the free movement'off the screw inland out of the tube in opera#A 4portion 16 and keyed to the ,broach 8 as shown.

An important feature of the invent-ion consists in an arrangement of parts whereby theloiig heavy draw screw 9 is supported.. entirely independently of its operating"n 'ut so that said' nut has at all times a free, and to a certain extent, loose engagement 'with the threads of the screw whereby friction losses from binding are prevented and a freev flow of lubricant through the long.' nut is insured. I For this purpose the screw '9 supported at its forward end in the slide" framework and having its inner end `also. bolted to the. gear case,-as seen at"24. v'The' rollers 21 hold the screwr spaced centrally tion.

The operating nut 25 is preferably of ,considerable length, so as to engage a considerable extent of the threads of the screw to thus distribute the working thrusts as far as possible, and this nut has mountingin Aanfupstanding bearing 26 rigid anchasy shown, integral with'the main framework., 'The nut is flanged to prevent endwisedisplacement especially on the side toward the broach against which the operativet-hrusts are received, as seen at 27, andball bearings 28 may be interposed between the nut and its bearings to minimize friction. As shown iiiost clearly Iin Fig. 10, the threads of the screw'have a free and to a certain extent a loose engagement with the coperative in ternal .threads -of the nutand ldo not reach tothe bottom Vo f the thread spaces, as seen at 29. It will be understood that this free,

antibinding engagement of the nut with the.

screw, which is permitted'by the independent supportingof the, screw, -permits lubricially in the space beyond the bottom of the cant supplied to the screw to circulate through the thread passages of the nut, espe-A threads of the screw, and through the thread passages at the bottom of the threads of the screw' beyond the threads of the .nuts

engaging therewith; thus all needless binding friction is eliminated and the po w'er"re- V quired' for operating the m'echanism is reduced to very near the theoretical minimum.

The screw 2,5 is driven by a gear 3Q keyed thereto and this in turn is driven Vby a pin'- ion 3fon a countershaft 32 journaled in `suitable bearings ir.. the framework beneath the screw'. The shaft 32 has loosely i'no'unted thereon a larger pinion33 and a smaller pinion 34. The inner sides of pinion 33 and. pinion i3.4 are provided with clutch faces 35, 36A spaced apartso thata double faced clutch. sleeve 37 'slidably splined on I a nonlcfircular portion of the. shaft 32- may 4eng-age 'either' of these clutch faces, but not both at the same time. yThe pinioiis33 and 34 .are continuously driven from a prime drive shaft 38 journaled in theframework .beneath shaft v32 and having a driving- 4p ulley- 39jflixed thereto. The pinionl 33 is driven directly from shaft 38 by a rela- 'tively sinazll-pinion`49ftiXe'd thereon,whi le lthe pinion 3415 is driven' inthe .opposite direction' from a'-,'largerpinion 41-'t`1xed on the shaft 38and indirectly connected with pin ion 34"-'jthrough an intermediate pinion42i Thus Withthe clutchsleeve 37 moved {toengage the pinion 33, the broach' vm: ty 'b"e moved with a relativelyslow and powerful movement on'its, cutting stroke-to the right in Fig,l 2,v while when `the clutchffisfs'hifted *LA further feature o'f-,my invention pro- Vides improved means whereby the broacli -so t-h'atf the drive is impartedfthroiigh pin-` ionl 34 the breach is -returned on its idle stroke at a relatively rapid rate.V

movement may be started by hand and then I stopped automaticallyv at a predetermined point, or at the en dof its travel,a's.`desired. To this end the clutch Vsleeve 37 isv engaged by a shipper .fork 43 'fixed to a rod 44 slidably mounted in the framework and connecte'dfor :operation through a link 45- from a. lever 46 pivoted at 47 near the frontv of the-machine.`

The automatic disconnecting lof the driving mechanism isetfccted by means of a rod 448 slidably carried in' bearings '49 and extending lengthwise of the frame near the top thereof. This rod has stops 50 51, and 52 fixed thereon, the'sto'p 50'near the-front end being adj-ustably clamped to the rod, as seen at 53, theintermediate stop 51- being niount-v i ed to swing into and. out of operative position on al sleeve 54 adju'stably clamped-.tothe rod, and the stop 52 near the rear endibeing permanentlyV fixed thereto.

The rod 48 is connected tothe lever 46V by means ofja, link 55'pivoted to the lever 46l and to a'lug 56 fixed to the 'rod '48. The. lever 46 is provided with. a slidable upwardly 'extendingjdetent 57 directly underneath rod 48jnormally urged up against the same by acoil spring 58 housed in vthe handleportion 59' and pressing against a knob 60 -atthe upper. end of .a rod 61 extendingupward'fromthe de# telit- ..Y The rod 48 is formed with an inset or "recess (S2-at a point where itis engaged by the*detent'57 when the lever 46 is in midi f position, e. extending vertically. As seen in Fig. 5, the knob or button 60 extends lup a little above the top of the handle portion 58 so that it may bc readily pressed downivard to disengage .the detent 57 from the inset (32 when it is desired to move the lever to start the machine. It Will be understood that by reason of the link connection of the rod 48 with the lever V46 being much nearer the pivot 47 of said lever than the inset 62, the tendency of the rod 48 to move said lever through the link 55 isat a much higher rate than that through the interengaging'connection of the detent57 with the' inset 62, and that thus When the detent 57 engages inset 62 the parts are locked from movement, this position being, as seen in Fig. 1, one to hold vthe clutch sleeve in intermediate'position and disengaged from both the pinions 33 and 34. When it is desired to' set the machine in operation the button 60 is pushed in to disengage the detent from the inset 62 and the lever 46 moved to engagethe clutch sleeve with the pinion 33, assuming the breach to have been in retracted position. The breach is thereupon drawn through the work until a lateral projection- 63 on the Vslide head 1Q engages the stopl 51 if this be in operative position, or otherwise the stop 52,'When the rod 48 is operated to move the parts tov the position shown in Fig. .1 Where they are locked by the detent again'engaging the inset 62. ,The broachmay be then retracted by disenga'ging theI detent and moving the lever in the opposite direction and at the end of this move-ment the projection 63 engaging the vstop 50 again moves the clutch to intermediate position, Where it islocked in the manner before'described. The three stops 50, 51, -52 have.

laterally extending portions similar to that lshown at 64 for the stop 50 in Fig. 9. These lateral projections fit over a smooth, finished, horizontal way 65 on the framework support-at one side o-f the slide head, this Way being provided. with a graduated scale 66 with Which a mark 67 on the projecttion 63 coperates toV indicate different definite predetermined positions at which thebroach may be stopped. To effect this stopping of the broach at different desired positions Without being drawn entirely through the Work, lthe movable sto 51 is employed. As before stated, this stop is adapted to be turned on its sleeve.

54 down to operative position so -as to be engaged by the projection 63 and it,

'with its sleeve, may be adjust-ed along theV rodV 48 so that the stop mechanism Awill rbe operated at the precise instant desired, as

determined by the scale 66 which may be graduated so as to be legible with reference to the dimensions ofthe broach employed.

An important feature of my invention consists in improved means for supplying lubricant to the breach and other operating mechanism. For this purpose, as seen in side Where they come together.

ation'is that the oil, being dravvn into the tooth spaces from pipe 69 las pinions 41,

42 rotate, is carried around ltheir `casings and that. carried by pinion 41 'isV delivered directly to pipe 70, Whereas that carried by so v pinion 42 is, upon the meshing of the teeth thereof With teeth 34, caused to circulate around the clearance space 71,-thus finally also entering pipe 70. The pipe 70 has its .delivery controlled by a piston valve device 72, the piston thereof 'being connected to be moved With the clutch sleeve 37 as seen at 73. This piston valve c onstruction- -is of the type. shown in Fig. (Sand is adapted to directthe oil up through a distributing pipe 74 to the various operating parts, with the piston 75 in one position, and to divert the oil back to the supply tank with the pis ton inthe other position, As shown at 7 G the machine framework is formed with a holding tank or pan for oil at vthe base of Vthe driving gearing;-this pan is thus in position `to catchA lthe oil'as it drips back from thev various bearings, and 'also that returned from the valve 72, While the oil is drawn uptherefrom for circulation by -the gear pump as described through the pipe 69, having a suitable strainer at its inlet. By reason of thefconnection of piston 75 with the clutch sleeve 37 it will be: observed that oilis supplied to the bearings. only when the machine is doing work, and

at other times While the gearing is running idly 1t is by-passed back to the tank.

n The oil supply to the broach is taken from a tank formed in the frontpe'dcstal of the framework, as seen at. v77, a.' suction pipe 78 leading thence to a rotary force pump 7 9. This pumpisof the inter-geared piston type and is driven -fromfgear 33 which engages a pinionV8l-'on'an extensiongofvshaft 82 to which `one., of the geared pistons 83 of the pump is fixed.v `The pump 7 9 delivers through a''conduit 84 to a piston valve controller 85 similar to the controller 72 .and i'.

likewise controlled from the clutch shifting mechanism through a lever 86 connected `to .an extension'of link 55 as seen at87`. ThisA piston controller, vacting in similar manner to thecontroller-72, is adapted to deliver the oil througha pipe 88 to the vpoint 89 Where the breach operates on the work, While the broach is being operated, and at other times returns the oil to the tank 77. The oil delivered to the'broaeh after lubri- 'cating the same drips down on to a table trav JOswinfYinOl 7-mounted en a iiv'et 91 e b t: 3

so as t-e be capable of being turned inte op..

erative position., or .out of the way, as required, and thence the o-il passes down through catch-pockets 92 and through an aperture 93 of the main frame work to the tank 77, this aperture 93 being some little distance above the top of the pockets 92 so that sediment and cutting debris may settle Adown te be removed at intervals.

The advantages of the machine have alf ready been quite fully described in connection with the description of the operating parts and need be only briefiy summarized. rlhe breach having its` endsu'pported` and accurately guided byl 'slide' head4 1 0, which is fitted to the tapered guide lribs 13, vibra-v tion is reduced and chattering.. in the work.

prevented and this result isigpessible even after-a long period of use by reason oft-he fact that the slide head is still accurately and closely guided along its guideways by adjust-nient of the gibsltv to takev up wear.'

It lis te be noted that the bed atftheje'ndto which the face plate G is fitted .is-Aopen se that n'lachining of the guide ribs-for Iwayswithin the bed can be readily effected. Also v the face place G being detachable, enables ditferent'types of face plates orwork supports to be provided, as required by tdiffer-- ent forms of work. The special mounting of the draw screw, whereby 1t 1s' supported independently e-f the nut permitting the' provision of clearance spaces at. the bottom of the threads 1n connect-ien with the lubrif `eating system, which keeps the activepor- 40 tion of the screw bathed inthe lubricant,

results in great economies as to the amount of power required and the direct rigidly mounted train of drivecennections for the screw in the base vfurther contrilnites te this result. By utilizing -the driving gear train as a pump,A asepaifate pumping outfit is dispensed with, it being' noted that the driving train is arranged to perform its pumping function without any vconsiderable modilicaf tion. k

. While all the several features of my imi',

proved mechanism ceperateas set'forth-te produce a particularly compact, eiiicient and economically operable machine,.it is te'ibe vunderstood that certain of the features described are capable ef use apart from others, and I therefore .do not desire to be limited te the complete 'illustrative embodiment of the invention herein disclosed except as. required by thetscopeof the claims. It is likewise to be understood that the structural details' of the various parts can-be widely modified .within the limits of4 the claims withoutdeparting from the spirit of the invention',and I therefore de not'desire screw with driving .driving connections thereto. -`i

nut having a lateral flange adapted to withstand the cutting thrusts. l

2. .A machine of the kind described, comprising a bed frame having lengthwise extending slide-ways ata recessed epentepV thereof, said bed having its front end open to permit access te said ways, a face plate removably secured to saidfront end, a slide head fitted to said ways, and' an operating connections engaged withsaid slide head. i

3. A machine ofthe kind described, cemliaving connections to operate a reciprocat-v ing tool, a nut engagedwith 'said screw and havlng bearingin the bed frame, and means for supporting said screw en its ends where- ,prising a bedj frame, an operatingscrew l by the nut is relievedf ofall strains er pressures from said screw, except working thrusts.'

4. A machine of the kind described, cemprising a bedframe 'havingslide-ways, a slide head iittedtherete adaptedte engage a breach, anv operating screw- 'supperted at one end of said slide head, a support for' the other end of said screw, and a nut `fitted in the -bed frame for operating saidsc'rew, the end bearings of Said screw supporting the same independently of'said nut.

5. A1 machine of the kind described, com,- prising a bed frame, an operating screw, a

`nut engaged with said screw, the threads being shortened te leave clearance spaces,.

and guide bearings carriedby the bed frame for the'eppesite'ends of said screw adapted to support it for alined reciproeatien, where-- Vby it is supported in fixed relation to the nut vand independently thereof.

ilo

x6. A machine of. the kind described, cemprising a bed frame Vhaving longitudinal slide-ways formed therein, a slide head lit-- ted to saidv ways adapted to receive a breach, an operatingscrew fixed for support at one end to said slide head, anout-beard bearing arranged to support the other end of' said `screw for alined reciprecatien, and a nut engaged with said screw with the Vthreads arranged to 'leave clearance spaces, said nut having-b'earingin the bed frame .and vwith prising a bed, frame-'having lengthwise exl. A machine of the kind described, com- I f tendingguide-ways, a slide head fitted gated nut having bearings in the bedframef l' thereto and adapted to carry a.br`oa ch, av .screw fixed for support at one endtoisaid-v slide head, an. out board bearing fori-the other. end of the screw in the form of aA tube carried by the bed frame and adapted,fin

connection with said slide liead`,xt.o support` the screw for alined'i'ecipi'ocation, an. elonengaged with said screw, and driving connections mounted inthe bed frame, having vprovision to limpart rotation to said nut in opposite directions at will.` i' I, Y

8. A machine ofv the kind described, comprising a bed frame, a. head slidably mount.` ed thereon with. abroach tixedthereto at,4

one side and anoperating screw atthe other,

Aan out boaidVbearing carried by the bed jframe-'forthe other end of said screw arrangediin conjunction with said head to support the same for lalin'ed reciprocation, and an'` elongated nut having bearing in the .bed frame engaged with said screw, the .threads of the nut and of the screw being shortened to provide clearance spaces for the passageoi lubricant. `f, h

IJ). machine of the kind described, comprising a bed frame, an operating screw having aslidable guide for its inner end on thebedfraine, -with provision for attachment ofa breach thereto,.an out board bearing ffor the outer end of said screw, consisting in a tube fixed tolthe bed frame with a roller spacer fixed to the screw to engage the tube, wherebythe screw is supported for I alined reciprocation, and 'a nut engagedr with said screw, said nut lhavingbearing in the bed frame and with driving connections mounted therein.

10. Amachine of the kind described, coin-v piising a' bed frame, an operating screw having a head 'at its innerjend slidably guidedon the bed frame, means for holdingl a broacli or the like secured to saidfhead, with provision for transverse adjustment relative thereto, andA means carried by -the bed frame for reciprocating the screw.

v11. A machine of the kindv described, comprising a bed frame, an. operating screw having a head "at its front end `slidahly guided on the bed frame, a holder for a bioach or the like., having interlocking engagementwith said head permitting vertical adjustment with a screw bolt arranged to eiiect such adjustment, and operating means for said screw mounted ontlie bed frame.

12.1 machine of the kind described, coniprising"a support, a screw slidably mounted.

thereon for alined 'reciprocat-ion; with a breach or the like connected thereto, operating gearing for said screw havinga disengageable connection," and means for controlling said gearing, said means having interlocking parts'adapted t0 come intaction ata predetermined point to lock the gearing in disengaged position.

13. A machine ot' the kind described, comprising a bed frame, an operating screw .guided thereon for alined reciprocation with a breach or the like fitted thereto, driving gearing-for said screw'having a disconnecting clutch, and means `for moving said clutch to' disconnected position afterja predeter` mined broach movement, said moving means having interengaging parts arranged to lock the'` .clutch in disengaged position.

' 14.' A machine of the kind described.` comprising 'a bed frame, an operating screw. slid- -ably guided tliereo-n'with a. broach or the like connected thei'etmdriving gearing'ior the/screw having a rdisconnecting clutch, a

manually operable lever connected with said clutch, a slidable rod with stops thereon arranged' to be controlled by the screw movement, said rod and lever having a link-connection, and having' a further detachable connection adapted to automatically come into action to lock the parts in clutch diseiigaged position. f

f* 15. A machine of the kind described, comprising aV bed frame, an operating screw slidably guided thereon with abroach or the like connectedA thereto, driving gearing for the screw havinga disconnecting clutch, a

hand lever lconnected with said clutch, a

Slidable stop carrying-rod, `controllable `by the screw, said rod having a' link connection with said lever. and a locking recess, and said lever having a detent adapted to engage said recess at a. position to lock the clutch in disengaged position, said detentI being yieldingly `disengageable from. said recess.y j

' 16. A machine` of the kind described, comprising a bed frame, anoperating screw slidably guided thereon'witli a'broaeli or .the like .connected thereto, driving gearing for said screw having a disconnecting clutch,

clutch operating means being connected to a ,controller for the lubricant supply to `simultaneously control the same.

17. A machine of the kind described, coin-l Slide head mounted on slide ways in said bed guided thereon for alined'recipro-` loperating means for-saidfclutch, means for v 4supplying lubricant to the apparatus, said 110 frame and supporting-the front end screw, driving gearing fori said screWhav-'f with stops thereon adapted to been'gaged by al part on saidslide head, a broach or the like connected with said'head for operation by the screw, and graduatio'ns formed along the path of said vslide head to ermit an accurate setting of the disconnecting mechanism with reference to the broach.

19. A machine of the kind described, comprising a bed fra-Ine having. lengthwise eX- tending slide-Ways formed in its upper portion, a slide head engaged With said Ways with an operating vSorenT and a breach or the like' to be operated, connected therewith,

driving means forsaid screw having a disconnecting clutch, and controlhng means for .the clutch having a stop .rod With stops thereon in position to be 'engaged by a part carried by said slide head, a top portion of the bed frame adjacent said slide head being,rv

111g a disconnecting clutch, controlling--having .ajQOperating partvprovided Witira means for said clutch, including a stop rod ldedvvith graduations, and said V,s1-ide head t rkpvfo'r .coperatiinn with said graduations topermitfaccurate adjustment of the disl -connecting'mechanism with referenceto any 'particular broach.

205A' machine of the kind described, com# prising a' bedframe' formed with oppositev ofthe converging sides of eachfof said ribs',l

.guide ribs with converging tapers at-their 4opposite sides, a slide headl fitted to said `r1bs, with wear gibs adjustable against one 35 connectedvto said slidehea'd, and driving v mechanism for saidvscrew.

In testimony'vvhereof, Ihavel signed my naine to this. specification, in the presencev` of two subscribing Witnesses. 1 l 7 y RALPH' R. LA POINTE. 4"Witnesses: f

A,flSinrJaMIN1 E". LEVY," "0. L. ROGERS. 'v v 

